Paintbrush



FIG. 1 is a perspective view of a paintbrush showing my new design;

FIG. 2 is a front elevational view of the paintbrush shown in FIG. 1, the rear elevational view and the top and bottom plan views being the same as the front elevational view;

FIG. 3 is a right side elevational view of the paintbrush shown in FIG. 1; and,

FIG. 4 is a left side elevational view of the paintbrush shown in FIG. 1. 

The ornamental design for a paintbrush, as shown and described. 